The National Instruments PCI-4472 is a high-accuracy data acquisition card for audio and vibration measurement applications. It delivers eight simultaneously sampled analog input channels, each with 24-bit delta-sigma ADC resolution, supporting sample rates up to 102.4 kS/s. The card features software-selectable AC/DC coupling, built-in IEPE signal conditioning for direct accelerometer and microphone connectivity, and automatic antialiasing filters that track the selected sampling rate. A 110 dB dynamic range and THD + noise floor of -102 dB (1 kHz, -1 dBFS, 50 kHz bandwidth) enable precision measurements in demanding environments. Overvoltage protection on positive inputs reaches ±42.4 Vpk. The pseudodifferential input architecture with 1,023-sample FIFO buffer and DMA data transfers integrates into PCI-based systems. External triggering via 5 V TTL/CMOS edge-sensitive digital input, plus RTSI synchronization, allows coordinated operation with other National Instruments devices. A 3.4 Hz high-pass filter provides AC coupling capability.
Technical Specifications
• Analog Input Channels: 8, simultaneously sampled
• ADC Resolution: 24 bits (delta-sigma architecture)
• Maximum Sample Rate: 102.4 kS/s
• Sample Rate Increments: 190.7 µS/s (fs > 51.2 kS/s); 95.37 µS/s (fs ≤ 51.2 kS/s)
• Input Configuration: Pseudodifferential
• Input Coupling: AC or DC (software-selectable)
• High-Pass Filter Cutoff: 3.4 Hz
• Overvoltage Protection: ±42.4 Vpk (positive input)
• FIFO Buffer: 1,023 samples
• Data Transfer Method: DMA
• Dynamic Range: 110 dB
• THD + Noise: -102 dB typical (1 kHz, -1 dBFS, 50 kHz measurement bandwidth)
– Key Features
• Integrated Electronic Piezoelectric (IEPE) signal conditioning for accelerometers and microphones
• Built-in antialiasing filters with automatic rate-dependent adjustment
• External trigger input: 5 V TTL/CMOS, edge-sensitive (rising or falling)
• RTSI bus for multi-device synchronization
• SMB front connector
– Physical & Environmental
• Dimensions: 17.5 × 10.7 cm (excluding connectors)
• Weight: ~200 g
• Operating Temperature: 0 to 50 °C
• Storage Temperature: -40 to 70 °C
– Compatibility & Integration
PCI bus interface enables direct integration into standard PC-based measurement systems. RTSI synchronization supports coordinated acquisition with other National Instruments hardware.
